Navis - BGCi Autonomous Profiling Float with Integrated Biogeochemical Sensors
Autonomous profiling float for Argo and other programs, with Sea-Bird CTD and Dissolved Oxygen sensor, integrated WET Labs MCOMS fluorometer/backscattering sensor, and multiple optional bolt-on sensors. Sufficient power for 250 CTD profile cycles to 2000 dbars (excluding optional sensors).
The Navis BGCi autonomous profiling float with integrated optical Dissolved Oxygen sensor (SBE 63) and WET Labs ECO-MCOMS is now available from Sea-Bird Scientific. The sensors take continuous measurements at 1 Hz through ascent, and provide high accuracy, resolution, and stability.
The SBE 41N CTD measures conductivity, temperature, and pressure (depth). The pump-controlled, T-C ducted flow minimizes salinity spiking caused by mismatch of temperature and conductivity measurements.
The individually calibrated SBE 63 Optical Dissolved Oxygen sensor is integrated within the CTD flow path, providing optimal correlation with CTD measurements.
The ECO-MCOMS uses demonstrated WET Labs technology to supply three optical sensors in one, providing chlorophyll a, backscattering, and CDOM, or chlorophyll a and 2 backscattering channels. MCOMS is integrated directly into the float end cap and co-located with DO and physical measurements.
As an option, multiple sensors can be attached to the float hull and cabled to the end cap. Data from all sensors, including the optional bolt-on sensors, is integrated in the data stream by the SBE 41N CTD electronics. Available bolt-on sensors include the Satlantic Deep SUNA (nitrate), Satlantic OCR 504 (4-channel radiometer), and WET Labs C-Rover 2000 (transmissometer).
- Navis Autonomous Profiling Float.
- SBE 63 Optical Dissolved Oxygen sensor.
- WET Labs ECO-MCOMS fluorometer / backscattering sensor.
- Up to four optional bolt-on sensors.
- SBE 41N CTD — integrated data stream for all sensors on float, and continuous profiling from 2000 dbars; same CTD family as current Argo floats.
- Flexible mission sequencing, allowing more frequent sampling in upper water column.
- Backed by Sea-Bird Scientific warranty.
Temperature: ± 0.002 °C
Salinity: ± 0.002 PSS-78
Pressure: ± 2 decibars
Dissolved Oxygen: ± 3 µmol/kg or ± 2%
Chlorophyll Fluorescence: ± 0.2% of full scale (relative to specific monoculture of phytoplankton [diatom] grown in specific light/nutrient conditions)
CDOM Fluorescence: ± 0.3% of full scale (relative to Quinine sulfate dihydrate)
Backscattering: ± 0.2% of full scale (relative to polystyrene beads [2 µm ±0.1 µm mean diameter])
Temperature: 0.0002 °C/year
Salinity: 0.001 PSS-78/year
Pressure: 0.8 decibars/year
Dissolved Oxygen: <1 µmol/kg/100,000 samples (20 °C; sample-based drift)
Volume Change: 1.7% (minimum fractional)
Depth Rating: 2000 dbars
Communications: Iridium Transceiver 9523 — RUDICS, circuit switched
Position: GPS, Garmin 15xL-W, mean acquisition time 70 sec
Park Interval: 1 - 15 days
Materials: Aluminum hull, seamless natural-rubber external bladders
Weight (in Air): < 20 kg (excluding optional bolt-on sensors)
Self-Activation: Starts operating automatically on deployment, when pressure reaches user-programmable setpoint
Internal Batteries: 4 packs of 3 DD lithium sulfuryl chloride cells (cannot ship in passenger aircraft; Class 9 Dangerous Goods)
Power Endurance: 250 2000-dbar cycles (mission dependent; excluding optional bolt-on sensors)
Memory: CTD stores one 2000-dbar CTD profile
Dimensions: Hull diameter 14 cm, Ring diameter 24 cm, Total length 167 cm